I do a lot of camping/hiking/detecting and you will always need a source of water. Have always packed a canteen or two or brought my filter. Have found a new system that works great. It is the "Steri-pen". It is an ultraviolet light device that will purify a quart of water in 90 seconds. Used it a few times in the Adirondack mts (beaver ponds and lakes/streams) and it works great. Just a couple ounces to carry and if you have a source of treatable water it is the way to go. A little pricey but lasts a long time. Retail is around 100 bucks but got mine on sale for 60.